// https://regex101.com/r/eMcXQ9/1
const regModuleId =
	/^(?<n>(?:@(?<org>[a-z0-9-~][a-z0-9-._~]*)\/)?(?<pkg>[a-z0-9-~][a-z0-9-._~]*))(?:@(?<v>[-a-z0-9><=_.^~]+))?(?<p>\/[^\r\n]*)?$/;

export type ParsedModuleId = {
	id: string; // name@version
	name: string; // @org/pkg, pkg
	version?: string; // 1.1.1
	range: string; // version, tag, range
	pkg: string;
	path?: string;
	org?: string;
	versioned: boolean; // is module id contain a version specifier
} & ({ scoped: false } | { scoped: true; org: string });

/**
 * Parse NPM module id
 *
 * @example
 * parseModuleId('@wener/reaction@latest/index.js')
 * // { id: '@wener/reaction@latest', name: '@wener/reaction', version: 'latest', range: 'latest', pkg: 'reaction', path: '/index.js', scoped: true, org: 'wener' }
 */
export function parseModuleId(s: string): ParsedModuleId | undefined {
	const groups = s.match(regModuleId)?.groups;
	if (!groups) {
		return undefined;
	}
	const { n: name, v: version, p: path, org, pkg } = groups;
	const scoped = Boolean(org);
	const v = /^\d+\.\d+\.\d+/.test(version) ? version : undefined;
	const range = version || 'latest';
	const o: ParsedModuleId = { id: `${name}@${range}`, name, range, scoped, pkg, org, versioned: Boolean(version) };
	if (v) {
		o.version = v;
	}
	if (path) {
		o.path = path;
	}
	if (!o.scoped) {
		delete o.org;
	}
	return o;
}